Hydration stage identification and phase transformation of calcium sulfoaluminate cement at early age

被引：163
作者：
Tang, S. W. [1 ]
Zhu, H. G. [2 ]
Li, Z. J. [1 ]
Chen, E. [1 ]
Shao, H. Y. [1 ]
机构：
[1] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Nano & Adv Mat Inst Ltd, Kowloon, Hong Kong, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 75卷
基金：
中国国家自然科学基金;
关键词：
Calcium sulfoaluminate cement; Hydration; Early age; Ettringite; Impedance measurement; Phase transformation; Gypsum; Hydration stages; Compressive strength; Setting time; ELECTRICAL-RESISTIVITY; MICROSTRUCTURE; STRENGTH; PASTES;
D O I：
10.1016/j.conbuildmat.2014.11.006
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper studies hydration stages and phase transformation mechanism of fresh calcium sulfoaluminate (CSA) cement. Features of different hydration stages of CSA cement paste are identified by non-contact impedance measurement (NCIM), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), heat evolution test, ion chromatograph and inductively coupled plasma. Ettringite (AFt) and monosulfate (AFm) are found as metastable phases and have poor crystallization degree at the early-age hydration. The unique transformation between AFt and AFm is observed. The influence of different w/c ratios is further studied by NCIM, setting time and compressive strength test. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：11 / 18
页数：8
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